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Not having one in front of me this would only be the case if the knob only goes down to 1 and stops and up to 10 and stops. If it goes below 1 like to a 0 value or higher than 10, then I would need to recalculate the steps.

thanks everyone for the help! only question i have left is on my machine for the amps it just has one through 10. What does 50 mean? how do i figure it out? Am i missing something on the machine? below is what my machine looks like. thanks again!

The knob on the right is the fine adjustment. It is a percentage of the middle knob. #1 = 10% # 5 = 50% #8 = 80% etc. of the middle knob range.

So if you set the middle knob at 100-250 amps, that gives you a 150 amp range. each number would be 10% of that range starting at 100.